# protobuf-codegen
This crate contains protobuf code generator and a `protoc-gen-rust` `protoc` plugin.
## protoc-gen-rust
`protoc-gen-rust` implements standard protobuf `protoc` plugin conventions.
Probably you do not want to use it directly in Rust environment, there are easier to use alternatives:
* [protoc-rust crate](https://github.com/stepancheg/rust-protobuf/tree/master/protoc-rust)
which can be invoked programmatically from `build.rs` of your project
which requires only `protoc` in `$PATH` but not `protoc-gen-rust`.
* [protobuf-codegen-pure crate](https://github.com/stepancheg/rust-protobuf/tree/master/protobuf-codegen-pure)
which behaves like protoc-rust, but does not depend on `protoc` binary
## But if you really want to use that plugin, here's the instruction
(Note `protoc` can be invoked programmatically with
[protoc crate](https://github.com/stepancheg/rust-protobuf/tree/master/protoc/))
0) Install protobuf for `protoc` binary.
On OS X [Homebrew](https://github.com/Homebrew/brew) can be used:
```
brew install protobuf
```
On Ubuntu, `protobuf-compiler` package can be installed:
```
apt-get install protobuf-compiler
```
Protobuf is needed only for code generation, `rust-protobuf` runtime
does not use `protobuf` library.
1) Install `protoc-gen-rust` program (which is `protoc` plugin)
It can be installed either from source or with `cargo install protobuf` command.
2) Add `protoc-gen-rust` to $PATH
If you installed it with cargo, it should be
```
PATH="$HOME/.cargo/bin:$PATH"
```
3) Generate .rs files:
```
protoc --rust_out . foo.proto
```
This will generate .rs files in current directory.